// SPDX-License-Identifier: MPL-2.0
// (c) Hare authors <https://harelang.org>

use bytes;
use crypto::cipher;
use errors;
use io;
use memio;

type gcmtestcase = struct {
	key: []u8,
	iv: []u8,
	plain: []u8,
	additional: []u8,
	cipher: []u8,
	tag: [16]u8,
};

// Testcases from Appendix B of https://csrc.nist.rip/groups/ST/toolkit/BCM/documents/proposedmodes/gcm/gcm-spec.pdf
const gcmtestcases: []gcmtestcase = [
	gcmtestcase {
		key = [0...]: [16]u8,
		iv = [0...]: [12]u8,
		plain = [],
		cipher = [],
		tag = [
			0x58, 0xe2, 0xfc, 0xce, 0xfa, 0x7e, 0x30, 0x61, 0x36,
			0x7f, 0x1d, 0x57, 0xa4, 0xe7, 0x45, 0x5a,
		],
		...
	},
	gcmtestcase {
		key = [0...]: [16]u8,
		iv = [0...]: [12]u8,
		plain = [0...]: [16]u8,
		cipher = [
			0x03, 0x88, 0xda, 0xce, 0x60, 0xb6, 0xa3, 0x92, 0xf3,
			0x28, 0xc2, 0xb9, 0x71, 0xb2, 0xfe, 0x78,
		],
		tag = [
			0xab, 0x6e, 0x47, 0xd4, 0x2c, 0xec, 0x13, 0xbd, 0xf5,
			0x3a, 0x67, 0xb2, 0x12, 0x57, 0xbd, 0xdf,
		],
		...
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39, 0x1a, 0xaf, 0xd2,
			0x55,
		],
		iv = [
			0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad, 0xde,
			0xca, 0xf8, 0x88,
		],
		cipher = [
			0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24, 0x4b,
			0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c, 0xe3, 0xaa,
			0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0, 0x35, 0xc1, 0x7e,
			0x23, 0x29, 0xac, 0xa1, 0x2e, 0x21, 0xd5, 0x14, 0xb2,
			0x54, 0x66, 0x93, 0x1c, 0x7d, 0x8f, 0x6a, 0x5a, 0xac,
			0x84, 0xaa, 0x05, 0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a,
			0xac, 0x97, 0x3d, 0x58, 0xe0, 0x91, 0x47, 0x3f, 0x59,
			0x85,
		],
		tag = [
			0x4d, 0x5c, 0x2a, 0xf3, 0x27, 0xcd, 0x64, 0xa6, 0x2c,
			0xf3, 0x5a, 0xbd, 0x2b, 0xa6, 0xfa, 0xb4,
		],
		...
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39,
		],
		additional = [
			0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xfe,
			0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xab, 0xad,
			0xda, 0xd2,
		],
		iv = [
			0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad, 0xde,
			0xca, 0xf8, 0x88,
		],
		cipher = [
			0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24, 0x4b,
			0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c, 0xe3, 0xaa,
			0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0, 0x35, 0xc1, 0x7e,
			0x23, 0x29, 0xac, 0xa1, 0x2e, 0x21, 0xd5, 0x14, 0xb2,
			0x54, 0x66, 0x93, 0x1c, 0x7d, 0x8f, 0x6a, 0x5a, 0xac,
			0x84, 0xaa, 0x05, 0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a,
			0xac, 0x97, 0x3d, 0x58, 0xe0, 0x91,
		],
		tag = [
			0x5b, 0xc9, 0x4f, 0xbc, 0x32, 0x21, 0xa5, 0xdb, 0x94,
			0xfa, 0xe9, 0x5a, 0xe7, 0x12, 0x1a, 0x47,
		],
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39,
		],
		additional = [
			0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xfe,
			0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xab, 0xad,
			0xda, 0xd2,
		],
		iv = [
			0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad,
		],
		cipher = [
			0x61, 0x35, 0x3b, 0x4c, 0x28, 0x06, 0x93, 0x4a, 0x77,
			0x7f, 0xf5, 0x1f, 0xa2, 0x2a, 0x47, 0x55, 0x69, 0x9b,
			0x2a, 0x71, 0x4f, 0xcd, 0xc6, 0xf8, 0x37, 0x66, 0xe5,
			0xf9, 0x7b, 0x6c, 0x74, 0x23, 0x73, 0x80, 0x69, 0x00,
			0xe4, 0x9f, 0x24, 0xb2, 0x2b, 0x09, 0x75, 0x44, 0xd4,
			0x89, 0x6b, 0x42, 0x49, 0x89, 0xb5, 0xe1, 0xeb, 0xac,
			0x0f, 0x07, 0xc2, 0x3f, 0x45, 0x98,
		],
		tag = [
			0x36, 0x12, 0xd2, 0xe7, 0x9e, 0x3b, 0x07, 0x85, 0x56,
			0x1b, 0xe1, 0x4a, 0xac, 0xa2, 0xfc, 0xcb,
		],
		...
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39,
		],
		additional = [
			0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xfe,
			0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xab, 0xad,
			0xda, 0xd2,
		],
		iv = [
			0x93, 0x13, 0x22, 0x5d, 0xf8, 0x84, 0x06, 0xe5, 0x55,
			0x90, 0x9c, 0x5a, 0xff, 0x52, 0x69, 0xaa, 0x6a, 0x7a,
			0x95, 0x38, 0x53, 0x4f, 0x7d, 0xa1, 0xe4, 0xc3, 0x03,
			0xd2, 0xa3, 0x18, 0xa7, 0x28, 0xc3, 0xc0, 0xc9, 0x51,
			0x56, 0x80, 0x95, 0x39, 0xfc, 0xf0, 0xe2, 0x42, 0x9a,
			0x6b, 0x52, 0x54, 0x16, 0xae, 0xdb, 0xf5, 0xa0, 0xde,
			0x6a, 0x57, 0xa6, 0x37, 0xb3, 0x9b,
		],
		cipher = [
			0x8c, 0xe2, 0x49, 0x98, 0x62, 0x56, 0x15, 0xb6, 0x03,
			0xa0, 0x33, 0xac, 0xa1, 0x3f, 0xb8, 0x94, 0xbe, 0x91,
			0x12, 0xa5, 0xc3, 0xa2, 0x11, 0xa8, 0xba, 0x26, 0x2a,
			0x3c, 0xca, 0x7e, 0x2c, 0xa7, 0x01, 0xe4, 0xa9, 0xa4,
			0xfb, 0xa4, 0x3c, 0x90, 0xcc, 0xdc, 0xb2, 0x81, 0xd4,
			0x8c, 0x7c, 0x6f, 0xd6, 0x28, 0x75, 0xd2, 0xac, 0xa4,
			0x17, 0x03, 0x4c, 0x34, 0xae, 0xe5,
		],
		tag = [
			0x61, 0x9c, 0xc5, 0xae, 0xff, 0xfe, 0x0b, 0xfa, 0x46,
			0x2a, 0xf4, 0x3c, 0x16, 0x99, 0xd0, 0x50,
		],
	},
	gcmtestcase {
		key = [
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		],
		iv = [
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00,
		],
		tag = [
			0xcd, 0x33, 0xb2, 0x8a, 0xc7, 0x73, 0xf7, 0x4b, 0xa0,
			0x0e, 0xd1, 0xf3, 0x12, 0x57, 0x24, 0x35,
		],
		...
	},
	gcmtestcase {
		key = [
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		],
		plain = [
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		],
		iv = [
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00,
		],
		cipher = [
			0x98, 0xe7, 0x24, 0x7c, 0x07, 0xf0, 0xfe, 0x41, 0x1c,
			0x26, 0x7e, 0x43, 0x84, 0xb0, 0xf6, 0x00,
		],
		tag = [
			0x2f, 0xf5, 0x8d, 0x80, 0x03, 0x39, 0x27, 0xab, 0x8e,
			0xf4, 0xd4, 0x58, 0x75, 0x14, 0xf0, 0xfb,
		],
		...
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08, 0xfe, 0xff,
			0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39, 0x1a, 0xaf, 0xd2,
			0x55,
		],
		iv = [
			0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad, 0xde,
			0xca, 0xf8, 0x88,
		],
		cipher = [
			0x39, 0x80, 0xca, 0x0b, 0x3c, 0x00, 0xe8, 0x41, 0xeb,
			0x06, 0xfa, 0xc4, 0x87, 0x2a, 0x27, 0x57, 0x85, 0x9e,
			0x1c, 0xea, 0xa6, 0xef, 0xd9, 0x84, 0x62, 0x85, 0x93,
			0xb4, 0x0c, 0xa1, 0xe1, 0x9c, 0x7d, 0x77, 0x3d, 0x00,
			0xc1, 0x44, 0xc5, 0x25, 0xac, 0x61, 0x9d, 0x18, 0xc8,
			0x4a, 0x3f, 0x47, 0x18, 0xe2, 0x44, 0x8b, 0x2f, 0xe3,
			0x24, 0xd9, 0xcc, 0xda, 0x27, 0x10, 0xac, 0xad, 0xe2,
			0x56,
		],
		tag = [
			0x99, 0x24, 0xa7, 0xc8, 0x58, 0x73, 0x36, 0xbf, 0xb1,
			0x18, 0x02, 0x4d, 0xb8, 0x67, 0x4a, 0x14,
		],
		...
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08, 0xfe, 0xff,
			0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39,
		],
		additional = [
			0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xfe,
			0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xab, 0xad,
			0xda, 0xd2,
		],
		iv = [
			0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad, 0xde,
			0xca, 0xf8, 0x88,
		],
		cipher = [
			0x39, 0x80, 0xca, 0x0b, 0x3c, 0x00, 0xe8, 0x41, 0xeb,
			0x06, 0xfa, 0xc4, 0x87, 0x2a, 0x27, 0x57, 0x85, 0x9e,
			0x1c, 0xea, 0xa6, 0xef, 0xd9, 0x84, 0x62, 0x85, 0x93,
			0xb4, 0x0c, 0xa1, 0xe1, 0x9c, 0x7d, 0x77, 0x3d, 0x00,
			0xc1, 0x44, 0xc5, 0x25, 0xac, 0x61, 0x9d, 0x18, 0xc8,
			0x4a, 0x3f, 0x47, 0x18, 0xe2, 0x44, 0x8b, 0x2f, 0xe3,
			0x24, 0xd9, 0xcc, 0xda, 0x27, 0x10,
		],
		tag = [
			0x25, 0x19, 0x49, 0x8e, 0x80, 0xf1, 0x47, 0x8f, 0x37,
			0xba, 0x55, 0xbd, 0x6d, 0x27, 0x61, 0x8c,
		],
		...
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08, 0xfe, 0xff,
			0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39,
		],
		additional = [
			0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xfe,
			0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xab, 0xad,
			0xda, 0xd2,
		],
		iv = [
			0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad,
		],
		cipher = [
			0x0f, 0x10, 0xf5, 0x99, 0xae, 0x14, 0xa1, 0x54, 0xed,
			0x24, 0xb3, 0x6e, 0x25, 0x32, 0x4d, 0xb8, 0xc5, 0x66,
			0x63, 0x2e, 0xf2, 0xbb, 0xb3, 0x4f, 0x83, 0x47, 0x28,
			0x0f, 0xc4, 0x50, 0x70, 0x57, 0xfd, 0xdc, 0x29, 0xdf,
			0x9a, 0x47, 0x1f, 0x75, 0xc6, 0x65, 0x41, 0xd4, 0xd4,
			0xda, 0xd1, 0xc9, 0xe9, 0x3a, 0x19, 0xa5, 0x8e, 0x8b,
			0x47, 0x3f, 0xa0, 0xf0, 0x62, 0xf7,
		],
		tag = [
			0x65, 0xdc, 0xc5, 0x7f, 0xcf, 0x62, 0x3a, 0x24, 0x09,
			0x4f, 0xcc, 0xa4, 0x0d, 0x35, 0x33, 0xf8,
		],
		...
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08, 0xfe, 0xff,
			0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39,
		],
		additional = [
			0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xfe,
			0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xab, 0xad,
			0xda, 0xd2,
		],
		iv = [
			0x93, 0x13, 0x22, 0x5d, 0xf8, 0x84, 0x06, 0xe5, 0x55,
			0x90, 0x9c, 0x5a, 0xff, 0x52, 0x69, 0xaa, 0x6a, 0x7a,
			0x95, 0x38, 0x53, 0x4f, 0x7d, 0xa1, 0xe4, 0xc3, 0x03,
			0xd2, 0xa3, 0x18, 0xa7, 0x28, 0xc3, 0xc0, 0xc9, 0x51,
			0x56, 0x80, 0x95, 0x39, 0xfc, 0xf0, 0xe2, 0x42, 0x9a,
			0x6b, 0x52, 0x54, 0x16, 0xae, 0xdb, 0xf5, 0xa0, 0xde,
			0x6a, 0x57, 0xa6, 0x37, 0xb3, 0x9b,
		],
		cipher = [
			0xd2, 0x7e, 0x88, 0x68, 0x1c, 0xe3, 0x24, 0x3c, 0x48,
			0x30, 0x16, 0x5a, 0x8f, 0xdc, 0xf9, 0xff, 0x1d, 0xe9,
			0xa1, 0xd8, 0xe6, 0xb4, 0x47, 0xef, 0x6e, 0xf7, 0xb7,
			0x98, 0x28, 0x66, 0x6e, 0x45, 0x81, 0xe7, 0x90, 0x12,
			0xaf, 0x34, 0xdd, 0xd9, 0xe2, 0xf0, 0x37, 0x58, 0x9b,
			0x29, 0x2d, 0xb3, 0xe6, 0x7c, 0x03, 0x67, 0x45, 0xfa,
			0x22, 0xe7, 0xe9, 0xb7, 0x37, 0x3b,
		],
		tag = [
			0xdc, 0xf5, 0x66, 0xff, 0x29, 0x1c, 0x25, 0xbb, 0xb8,
			0x56, 0x8f, 0xc3, 0xd3, 0x76, 0xa6, 0xd9,
		],
		...
	},
	gcmtestcase {
		key = [
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00,
		],
		iv = [
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00,
		],
		tag = [
			0x53, 0x0f, 0x8a, 0xfb, 0xc7, 0x45, 0x36, 0xb9, 0xa9,
			0x63, 0xb4, 0xf1, 0xc4, 0xcb, 0x73, 0x8b,
		],
		...
	},
	gcmtestcase {
		key = [
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00,
		],
		plain = [
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		],
		iv = [
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00,
		],
		cipher = [
			0xce, 0xa7, 0x40, 0x3d, 0x4d, 0x60, 0x6b, 0x6e, 0x07,
			0x4e, 0xc5, 0xd3, 0xba, 0xf3, 0x9d, 0x18,
		],
		tag = [
			0xd0, 0xd1, 0xc8, 0xa7, 0x99, 0x99, 0x6b, 0xf0, 0x26,
			0x5b, 0x98, 0xb5, 0xd4, 0x8a, 0xb9, 0x19,
		],
		...
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08, 0xfe, 0xff,
			0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d, 0x6a, 0x8f,
			0x94, 0x67, 0x30, 0x83, 0x08,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39, 0x1a, 0xaf, 0xd2,
			0x55,
		],
		iv = [
			0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad, 0xde,
			0xca, 0xf8, 0x88,
		],
		cipher = [
			0x52, 0x2d, 0xc1, 0xf0, 0x99, 0x56, 0x7d, 0x07, 0xf4,
			0x7f, 0x37, 0xa3, 0x2a, 0x84, 0x42, 0x7d, 0x64, 0x3a,
			0x8c, 0xdc, 0xbf, 0xe5, 0xc0, 0xc9, 0x75, 0x98, 0xa2,
			0xbd, 0x25, 0x55, 0xd1, 0xaa, 0x8c, 0xb0, 0x8e, 0x48,
			0x59, 0x0d, 0xbb, 0x3d, 0xa7, 0xb0, 0x8b, 0x10, 0x56,
			0x82, 0x88, 0x38, 0xc5, 0xf6, 0x1e, 0x63, 0x93, 0xba,
			0x7a, 0x0a, 0xbc, 0xc9, 0xf6, 0x62, 0x89, 0x80, 0x15,
			0xad,
		],
		tag = [
			0xb0, 0x94, 0xda, 0xc5, 0xd9, 0x34, 0x71, 0xbd, 0xec,
			0x1a, 0x50, 0x22, 0x70, 0xe3, 0xcc, 0x6c,
		],
		...
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08, 0xfe, 0xff,
			0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d, 0x6a, 0x8f,
			0x94, 0x67, 0x30, 0x83, 0x08,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39,
		],
		additional = [
			0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xfe,
			0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xab, 0xad,
			0xda, 0xd2,
		],
		iv = [
			0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad, 0xde,
			0xca, 0xf8, 0x88,
		],
		cipher = [
			0x52, 0x2d, 0xc1, 0xf0, 0x99, 0x56, 0x7d, 0x07, 0xf4,
			0x7f, 0x37, 0xa3, 0x2a, 0x84, 0x42, 0x7d, 0x64, 0x3a,
			0x8c, 0xdc, 0xbf, 0xe5, 0xc0, 0xc9, 0x75, 0x98, 0xa2,
			0xbd, 0x25, 0x55, 0xd1, 0xaa, 0x8c, 0xb0, 0x8e, 0x48,
			0x59, 0x0d, 0xbb, 0x3d, 0xa7, 0xb0, 0x8b, 0x10, 0x56,
			0x82, 0x88, 0x38, 0xc5, 0xf6, 0x1e, 0x63, 0x93, 0xba,
			0x7a, 0x0a, 0xbc, 0xc9, 0xf6, 0x62,
		],
		tag = [
			0x76, 0xfc, 0x6e, 0xce, 0x0f, 0x4e, 0x17, 0x68, 0xcd,
			0xdf, 0x88, 0x53, 0xbb, 0x2d, 0x55, 0x1b,
		],
		...
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08, 0xfe, 0xff,
			0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d, 0x6a, 0x8f,
			0x94, 0x67, 0x30, 0x83, 0x08,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39,
		],
		additional = [
			0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xfe,
			0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xab, 0xad,
			0xda, 0xd2,
		],
		iv = [
			0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad,
		],
		cipher = [
			0xc3, 0x76, 0x2d, 0xf1, 0xca, 0x78, 0x7d, 0x32, 0xae,
			0x47, 0xc1, 0x3b, 0xf1, 0x98, 0x44, 0xcb, 0xaf, 0x1a,
			0xe1, 0x4d, 0x0b, 0x97, 0x6a, 0xfa, 0xc5, 0x2f, 0xf7,
			0xd7, 0x9b, 0xba, 0x9d, 0xe0, 0xfe, 0xb5, 0x82, 0xd3,
			0x39, 0x34, 0xa4, 0xf0, 0x95, 0x4c, 0xc2, 0x36, 0x3b,
			0xc7, 0x3f, 0x78, 0x62, 0xac, 0x43, 0x0e, 0x64, 0xab,
			0xe4, 0x99, 0xf4, 0x7c, 0x9b, 0x1f,
		],
		tag = [
			0x3a, 0x33, 0x7d, 0xbf, 0x46, 0xa7, 0x92, 0xc4, 0x5e,
			0x45, 0x49, 0x13, 0xfe, 0x2e, 0xa8, 0xf2,
		],
		...
	},
	gcmtestcase {
		key = [
			0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d,
			0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08, 0xfe, 0xff,
			0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, 0x6d, 0x6a, 0x8f,
			0x94, 0x67, 0x30, 0x83, 0x08,
		],
		plain = [
			0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, 0xa5,
			0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, 0x86, 0xa7,
			0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, 0x2e, 0x4c, 0x30,
			0x3d, 0x8a, 0x31, 0x8a, 0x72, 0x1c, 0x3c, 0x0c, 0x95,
			0x95, 0x68, 0x09, 0x53, 0x2f, 0xcf, 0x0e, 0x24, 0x49,
			0xa6, 0xb5, 0x25, 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d,
			0xe6, 0x57, 0xba, 0x63, 0x7b, 0x39,
		],
		additional = [
			0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xfe,
			0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, 0xab, 0xad,
			0xda, 0xd2,
		],
		iv = [
			0x93, 0x13, 0x22, 0x5d, 0xf8, 0x84, 0x06, 0xe5, 0x55,
			0x90, 0x9c, 0x5a, 0xff, 0x52, 0x69, 0xaa, 0x6a, 0x7a,
			0x95, 0x38, 0x53, 0x4f, 0x7d, 0xa1, 0xe4, 0xc3, 0x03,
			0xd2, 0xa3, 0x18, 0xa7, 0x28, 0xc3, 0xc0, 0xc9, 0x51,
			0x56, 0x80, 0x95, 0x39, 0xfc, 0xf0, 0xe2, 0x42, 0x9a,
			0x6b, 0x52, 0x54, 0x16, 0xae, 0xdb, 0xf5, 0xa0, 0xde,
			0x6a, 0x57, 0xa6, 0x37, 0xb3, 0x9b,
		],
		cipher = [
			0x5a, 0x8d, 0xef, 0x2f, 0x0c, 0x9e, 0x53, 0xf1, 0xf7,
			0x5d, 0x78, 0x53, 0x65, 0x9e, 0x2a, 0x20, 0xee, 0xb2,
			0xb2, 0x2a, 0xaf, 0xde, 0x64, 0x19, 0xa0, 0x58, 0xab,
			0x4f, 0x6f, 0x74, 0x6b, 0xf4, 0x0f, 0xc0, 0xc3, 0xb7,
			0x80, 0xf2, 0x44, 0x45, 0x2d, 0xa3, 0xeb, 0xf1, 0xc5,
			0xd8, 0x2c, 0xde, 0xa2, 0x41, 0x89, 0x97, 0x20, 0x0e,
			0xf8, 0x2e, 0x44, 0xae, 0x7e, 0x3f,
		],
		tag = [
			0xa4, 0x4a, 0x82, 0x66, 0xee, 0x1c, 0x8e, 0xb0, 0xc8,
			0xb5, 0xd4, 0xcf, 0x5a, 0xe9, 0xf1, 0x9a,
		],
		...
	},
];

@test fn gcm_encrypt() void = {
	for (let i = 0z; i < len(gcmtestcases); i += 1) {
		const t = gcmtestcases[i];

		let b = ct64();
		ct64_init(&b, t.key);

		let result: []u8 = if (len(t.cipher) == 0) {
			yield [];
		} else {
			yield alloc([0...], len(t.cipher));
		};
		defer free(result);
		let resultbuf = memio::fixed(result);

		let gstream = cipher::gcm();
		cipher::gcm_init(&gstream, &resultbuf, &b, t.iv, t.additional);
		defer io::close(&gstream)!;

		io::writeall(&gstream, t.plain)!;
		let tag: [cipher::GCMTAGSZ]u8 = [0...];
		cipher::gcm_seal(&gstream, tag);

		assert(bytes::equal(t.cipher, result));
		assert(bytes::equal(t.tag, tag));
	};
};

@test fn gcm_decrypt() void = {
	for (let i = 0z; i < len(gcmtestcases); i += 1) {
		const t = gcmtestcases[i];

		let b = ct64();
		ct64_init(&b, t.key);

		let result: []u8 = if (len(t.cipher) == 0) {
			yield [];
		} else {
			yield alloc([0...], len(t.cipher));
		};
		defer free(result);
		let cipherbuf = memio::fixed(t.cipher);

		let gstream = cipher::gcm();
		cipher::gcm_init(&gstream, &cipherbuf, &b, t.iv, t.additional);
		defer io::close(&gstream)!;

		io::readall(&gstream, result)!;

		assert(bytes::equal(t.plain, result));
		cipher::gcm_verify(&gstream, t.tag)!;

		let wrongtag: [16]u8 = t.tag;
		wrongtag[0] += 1;
		match (cipher::gcm_verify(&gstream, wrongtag)) {
		case errors::invalid => void;
		case =>
			assert(false);
		};
	};
};

@test fn gcm_inplace() void = {
	for (let i = 0z; i < len(gcmtestcases); i += 1) {
		const t = gcmtestcases[i];

		let b = ct64();
		ct64_init(&b, t.key);

		let result: []u8 = if (len(t.plain) == 0) {
			yield [];
		} else {
			let r: []u8 = alloc([0...], len(t.plain));
			r[..] = t.plain[..];
			yield r;
		};
		defer free(result);
		let resultbuf = memio::fixed(result);

		let gstream = cipher::gcm();
		// beware: did not close the stream for sake of simplicity
		cipher::gcm_init(&gstream, &resultbuf, &b, t.iv, t.additional);

		io::writeall(&gstream, result)!;

		let tag: [cipher::GCMTAGSZ]u8 = [0...];
		cipher::gcm_seal(&gstream, tag);
		assert(bytes::equal(t.cipher, result));
		assert(bytes::equal(t.tag, tag));

		let resultbuf = memio::fixed(result);
		let gstream = cipher::gcm();
		cipher::gcm_init(&gstream, &resultbuf, &b, t.iv, t.additional);
		io::readall(&gstream, result)!;

		assert(bytes::equal(t.plain, result));
		cipher::gcm_verify(&gstream, t.tag)!;
	};
};
